豆科植物固氮如何同时减少化肥需求和氧化亚氮排放？
How does legume nitrogen fixation cut both fertilizer need and N2O emissions?
根瘤菌把空气中的氮直接变成植物可吸收的形式，减少合成氮肥施用；而化肥过量正是农田氧化亚氮（强温室气体）的主要来源，少施就少排。
Rhizobia convert atmospheric N into plant-usable form, reducing synthetic fertilizer; excess fertilizer is the main farm source of N2O, a potent greenhouse gas, so less application means less emission.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Xu 等,《Postponed nitrogen fertilizer topdressing mitigates N2O emissions in legume/cereal intercropping systems through reduced bacteria amoA gene abundance》,European Journal of Agronomy,2026 (DOI: 10.1016/j.eja.2026.128230)
Xu et al., 'Postponed nitrogen fertilizer topdressing mitigates N2O emissions in legume/cereal intercropping systems through reduced bacteria amoA gene abundance', European Journal of Agronomy, 2026, DOI: 10.1016/j.eja.2026.128230
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1016/j.eja.2026.128230
#固氮 #豆科 #氧化亚氮
免耕和覆盖作物是怎样提升土壤有机碳的？
How do no-till and cover crops build soil organic carbon?
免耕减少土壤翻动导致的碳暴露与侵蚀，覆盖作物在休耕期持续给土壤输入根系与残体有机质，二者共同增加土壤碳储并改善团粒结构。
No-till limits carbon exposure and erosion from turning soil; cover crops keep feeding roots and residues into soil during fallow, together raising soil carbon and structure.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Nascente 等,《Cover crops and no-till effects on physical fractions of soil organic matter》,Soil and Tillage Research,2013 (DOI: 10.1016/j.still.2013.02.008)
Nascente et al., 'Cover crops and no-till effects on physical fractions of soil organic matter', Soil and Tillage Research, 2013, DOI: 10.1016/j.still.2013.02.008
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1016/j.still.2013.02.008
#免耕 #覆盖作物 #土壤碳
“食物里程”真能全面衡量一盘食物的碳足迹吗？
Can 'food miles' fully measure a meal's carbon footprint?
不能。对牛羊肉而言，反刍动物肠道甲烷往往占其碳足迹大头，远超运输；本地化对低排放强度的蔬果更有意义，整体需看全生命周期。
No. For beef and lamb, ruminant methane often dominates the footprint, far above transport; localization matters more for low-emission produce; the whole life cycle counts.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
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Our World in Data
Our World in Data
#食物里程 #碳足迹 #反刍甲烷